Waste Spark Coils

[James Ballenger]

	$20 buys you a very strong two post waste spark coil (for two cylinders).
The ignitors I am using now are Smart Bosch units that I have been able to
source for $35 each so it is $55/2 per cylinder or $27.50 for my
application.  You could use cheaper ignitors to reduce the cost, I use the
smart ones because I rev from 1400 rpm to 14000 rpm.  These coils require
some sort of mount.

	The GM coils with ignitors built in are CNP and require 1 per cylinder.
These are $40 per cylinder and I don't think they are any stronger than the
waste spark coils.  I am also unsure of the ignitor circuit with regard to
whether or not they are auto-dwell (Smart).  I have a GM part #, but I have
to verify it.  These coils can be directly mounted.

James Ballenger


>-----Original Message-----
>From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
>Behalf Of Jurgen Hartwig
>Sent: Thursday, February 22, 2001 10:43 AM
>To: diy_efi at diy-efi.org
>Subject: Re: Waste Spark Coils
>
>
>> On a similar subject, Jurgen said 2nd gen RX7 but I am not Mazda
>> literate so i don't know my first Gen from my fourth gen.  on the
>subject
>> of the RX7 coils, saying that they have that they have the ignitor in
>them, does
>> that mean that they are fired with a TTL level input?  if so
>that would
>> kill two birds with one stone for me.
>
>
>Hi, 2nd Gen RX-7s are cars from 86-91.  I believe the earlier
>cars used a
>distributor and later cars used a different style ignition coil.
>Remember, though, the leading coil is the only waste spark coil.  The
>trailing coil is a dual post coil, but a trigger wire
>alternately triggers
>a single post.
>
>Regarding the input, I really am not sure.  At the risk of
>sounding really
>stupid, what does TTL stand for?  I have seen the acronym, but
>never knew
>it's meaning.
>
>Is there any way I can test for this?
>
>Regarding the GM coils, I thought $20 bought you the coil, and
>you still
>had to buy the igniters.  If I can get GM coils and igniter
>for less than
>$40, then that's a better deal than the RX-7 coils.
>
>Is the GM coil a self-contained unit that can be mounted
>easily, or is it
>part of a module (i.e. need a mounting bracket)?
>
>Jay
>
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